Final answer:
UHT pasteurization heats milk to 138 °C for 2 seconds, allowing it to remain shelf-stable for up to 90 days when stored in unopened airtight containers without refrigeration.
Step-by-step explanation:
The question revolves around the shelf-life of milk products that have undergone ultra-pasteurization, also known as UHT pasteurization. This method of pasteurization involves heating the milk to 138 °C for a minimum of 2 seconds. The ultra-pasteurized milk is then sealed in airtight containers and does not require refrigeration. The key advantage of UHT pasteurization is the extended shelf life it provides to milk products.
The milk can remain usable for up to 90 days without refrigeration, assuming that the container remains unopened and the milk is stored properly. This is significantly longer than the shelf-life provided by traditional HTST pasteurization methods. Microbiology guidelines strongly advise against consuming raw or unpasteurized dairy due to the presence of potentially deadly microorganisms. Because of this, UHT pasteurization is highly beneficial as it effectively sterilizes the milk, making it safe for longer consumption.